[gst-devel] Segmentation fault while using GST_BUFFER macros
sudarshan bisht
bisht.sudarshan at gmail.com
Fri Nov 7 05:49:44 CET 2008
Hi Irfan
Did u check outputbuf is allocated properly as a GstBuffer ?
On Thu, Nov 6, 2008 at 9:02 PM, irfanshaikh <irfanshaikh at tataelxsi.co.in>wrote:
> Hi Sudarshan,
>
> I was not able to do changes as you suggested to me. Instead i tried the
> following. Since i just needed a flag or something which my next plug-in
> element should recognize i used following.
>
> for(m=0; m<pkt->payload_count; m++)
> {
> if(pkt->payloads[m].key_frame == 1)
> {
> g_print("Inside IF\n");
> GST_BUFFER_OFFSET(outputbuf) =
> 1;
> /*Segmentation fault*/
> GST_BUFFER_FLAG_SET (outputbuf,
> GST_BUFFER_FLAG_DELTA_UNIT); /*Segmentation fault*/
>
> GST_BUFFER_DURATION(outputbuf)=(GstClockTime)1;
> /*Segmentation fault*/
> /*
> At RTP ASF payloader check using...
> GST_BUFFER_FLAG_IS_SET(buf, GST_BUFFER_FLAG_DELTA_UNIT);
> */
> g_print("In Packet Payload %d consists of KEY FRAME\n", m);
> }
> }
> I am not able to use any of the macros, if i use them i get a segmentation
> fault. How shall i avoid Segmentation fault.
>
>
> Regards,
> Irfan
>
>
> -----Original Message-----
> *From:* sudarshan bisht [mailto:bisht.sudarshan at gmail.com]
> *Sent:* Thursday, November 06, 2008 2:14 PM
> *To:* Discussion of the development of GStreamer
> *Subject:* Re: [gst-devel] Size of output buffer
>
> Hi Irfan ,
> Yes this can be done in better way . Use gst_caps_new_simple ()
> to set the flag for key frame . You can see how asfdemux sends extradata to
> decoder .( see gstasfdemux.c file ) ,
> Once you do this , you can receive the same data in decoder or next
> element . So in order to receive this information next element has to
> register funtion using gst_pad_set_setcaps_function( ) ( just check some
> decode's code which gets frame height and width from demuxer in this manner
> ) .
>
>
> On Thu, Nov 6, 2008 at 11:23 AM, Irfan Shaikh <irfanshaikh at tataelxsi.co.in
> > wrote:
>
>>
>> Hi sudarshan,
>>
>> I have completed the asfparser plug-in code now itz working fine as
>> per requirrement :-)
>>
>> I am only facing a small problem. I want to convey to next Plug-in
>> element. Whether ASF data packet i m sending to next element consists of Key
>> frame or no ?
>>
>>
>> For conveying this information i have thought of using following field of
>> GstBuffer.
>> guint64 offset;
>> I would either SET it or RESET it while pushing the data
>> gst_pad_push(asfparse->srcpad, outputbuf)
>>
>>
>> Is there any other convinent{feasible} way of conveying the above
>> information to next plug-in element {Is there some macro or Some flag that i
>> can use using GstBuffer before pushing outputbuf}
>> So as to convey to next element whether the outputbuf {consisting ASF data
>> packet} has a KEY frame or no ??
>>
>> Regards,
>> Irfan
>>
>>
>> -----Original Message-----
>> From: sudarshan bisht [mailto:bisht.sudarshan at gmail.com]
>> Sent: Thu 11/6/2008 10:55 AM
>> To: Discussion of the development of GStreamer
>> Subject: Re: [gst-devel] Size of output buffer
>>
>> Hi Irfan ,
>> U r right data is pushed on src pad .
>>
>> On Tue, Oct 21, 2008 at 6:58 PM, Irfan Shaikh
>> <irfanshaikh at tataelxsi.co.in>wrote:
>>
>> >
>> > Thanks a lot Sudarshan....
>> >
>> > The sample code which you have send is really helping me a lot.
>> >
>> > If i am not wrong, I think-------- gst_pad_push(sinkpad, my_buffer)
>> should
>> > be like------ gst_pad_push(asfparse->srcpad, my_buffer).
>> >
>> > Am i corrrect ?
>> >
>> > Thanks a lot for your help and support,
>> > Regards,
>> > Irfan
>> >
>> >
>> >
>> > -----Original Message-----
>> > From: sudarshan bisht [mailto:bisht.sudarshan at gmail.com<
>> bisht.sudarshan at gmail.com>
>> > ]
>> > Sent: Tue 10/21/2008 6:44 PM
>> > To: Discussion of the development of GStreamer
>> > Subject: Re: [gst-devel] Size of output buffer
>> >
>> > Hi Irfan ,
>> >
>> > I think here no need to use circular buffer , because the
>> buffer
>> > which u receive in ur plugin , u have to unref that after properly
>> copying
>> > required buffer from that . And the buffer which ul allocate in your
>> > plugin
>> > will be sent u next element thus will be unref by the next element .
>> >
>> > I am writing a piece of code , may give u some hint :-
>> >
>> > asf_parser_plugin_chain(GstPad pad, GstBuffer *buffer)
>> > {
>> >
>> > gint packet_size=0;
>> > GstBuffer *my_buffer=NULL;
>> >
>> > packet_size = parse_buffer(GST_BUFFER_DATA(buffer) ); // get
>> > the packet size
>> >
>> > my_buffer=gst_buffer_new_and_alloc ( packet_size );
>> >
>> >
>> > memcpy(GST_BUFFER_DATA( my_buffer), GST_BUFFER_DATA(buffer),
>> packet_size
>> > ); // can use other APIs also provided by GstBuffer (
>> >
>> >
>> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html
>> > )
>> >
>> > gst_pad_push(sinkpad, my_buffer);
>> >
>> > gst_buffer_unref(buffer) ; // check if u have copied all the
>> data
>> >
>> > return GST_FLOW_OK ;
>> > }
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > On Tue, Oct 21, 2008 at 5:13 PM, Irfan Shaikh
>> > <irfanshaikh at tataelxsi.co.in>wrote:
>> >
>> > > Hi sudarshan,
>> > >
>> > > Thanks a lot for your reply. I am pretty clear now.
>> > >
>> > > Earlier i had decided some other appoach as follows:
>> > > SO now i think i should not use A circular buffer, directly
>> i
>> > can
>> > > use the existing Gstreamer buffer ritee ??
>> > >
>> > > Thanks for your reply.
>> > >
>> > > Regarding my query :
>> > > 1)I have written an ASF parser code which reads an ASF file from
>> a
>> > > file location path.
>> > > 2)It uses fseek and fread to read the data from file in a
>> temperory
>> > > buffer
>> > > 3)It uses the temporary buffer to parse the ASf headers
>> > > 4)Lastly collect the ASF data packets after parsing the headers
>> > into
>> > > another temperory bufffer (tempbuf).
>> > > 5) When i make ASF parser as gstreamer plugin, i will use
>> > > gst_pad_push (asfparse->srcpad, tempbuf);
>> > >
>> > > I am clear about the output interface when i make the ASF parser as
>> > > gstreamer plug-in.
>> > >
>> > > Actual scenario:
>> > >
>> > > 1) Input module to ASF parser plug-in is output from "ffmux_asf"
>> > > which will be in form of data buffers.
>> > > 2) I will need some buffer to collect these data buffers
>> > > 3) I thought of having a "Circular buffer" to take input from
>> > > ffmux_asf.{Is it feasible to use a normal buffer like uint8_t *Newbuf
>> to
>> > > collect
>> > > data buffers from ffmux_asf ?? {If YES. How much memory
>> should i
>> > > allocate for NewBuf}}
>> > > 4) Since my application is related to Live Streaming the buffer
>> > > NewBuf size can be huge.
>> > > 5) Circular buffer would have been useful.Since i will free the
>> > > memory as soon as i read the Circular buffer.
>> > > 6) I can use pointer operations similar to file operations
>> > >
>> > > In gstreamer i have GstBuffer *buf, If i use circular buffer how can i
>> > use
>> > > the existing "buf".
>> > >
>> > > Regards,
>> > > Irfan.
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >
>> > > -----Original Message-----
>> > > From: sudarshan bisht [mailto:bisht.sudarshan at gmail.com<
>> bisht.sudarshan at gmail.com>
>> > <bisht.sudarshan at gmail.com>
>> > > ]
>> > > Sent: Tue 10/21/2008 4:53 PM
>> > > To: Discussion of the development of GStreamer
>> > > Subject: Re: [gst-devel] Size of output buffer
>> > >
>> > > HI Irfan ,
>> > > You are trying to write a ASF Parser plugin which will
>> be
>> > > used
>> > > after ffmux_asf in pipeline .
>> > > Now you want to parse data packets and send them to next element .
>> > >
>> > > The buffer you get from ffmux_asf is already allocated so you dont
>> > need
>> > > to allocated a separate buffer for that .
>> > > To know the size of input buffer in your ASF Parser plugin you can
>> use
>> > > GST_BUFFER_SIZE(buffer) .
>> > > So now you have to parse data part of this buffer , because data
>> > part
>> > > of the buffer have the actual data .
>> > > For your outgoing packets allocate one more GstBuffer and copy
>> the
>> > > required number of bytes of data from received buffer to this buffer
>> and
>> > > push this buffer to next element.
>> > >
>> > > You can use adapter APIs also to make it simpler . Read GstBuffer
>> APIs
>> > > thoroughly for good practice.
>> > >
>> > >
>> > >
>> > > On Tue, Oct 21, 2008 at 3:59 PM, Irfan Shaikh
>> > > <irfanshaikh at tataelxsi.co.in>wrote:
>> > >
>> > > >
>> > > >
>> > > >
>> > > > -----Original Message-----
>> > > > From: sudarshan bisht [mailto:bisht.sudarshan at gmail.com<
>> bisht.sudarshan at gmail.com>
>> > <bisht.sudarshan at gmail.com>
>> > > <bisht.sudarshan at gmail.com>
>> > > > ]
>> > > > Sent: Tue 10/21/2008 2:25 PM
>> > > > To: Discussion of the development of GStreamer
>> > > > Subject: Re: [gst-devel] Size of output buffer
>> > > >
>> > > > Hi
>> > > >
>> > > > "gst_pad_push_event" function pushes only events ( EOS , new
>> segment
>> > etc
>> > > )
>> > > > not buffer , in order to push buffer use "gst_pad_push" api .
>> > > >
>> > > > On Tue, Oct 21, 2008 at 1:58 PM, Irfan Shaikh
>> > > > <irfanshaikh at tataelxsi.co.in>wrote:
>> > > >
>> > > > >
>> > > > > Hi Julien,
>> > > > >
>> > > > > Thanks for your reply..
>> > > > >
>> > > > > For ffmux_asf plug-in in gstffmpegmux.c.
>> > > > >
>> > > > > Is "gst_pad_push_event" is the fuction which pushes the
>> buffer
>> > > which
>> > > > > has ASF data into sink pad of next elemnt ?
>> > > > > i.e. gst_pad_push_event (ffmpegmux->srcpad, gst_event_new_eos
>> > ());
>> > > > > When i checked the sise of buffer its variable in size.
>> > > > >
>> > > > >
>> > > > > I need to allocate buffer for the next module to
>> "ffmux_asf".
>> > > Which
>> > > > > is an asf parse. i need to allocate buffer in asf parser plugin. I
>> > > wanted
>> > > > to
>> > > > > know what size of buffer should i allocate for ASF parser plug-in
>> to
>> > > take
>> > > > > i/p from ffmux_asf
>> > > > >
>> > > > > I checked the buffer size in ffmux_asf in gst_ffmpegmux_collected
>> > > > > (GstCollectPads * pads, gpointer user_data)
>> > > > >
>> > > > > But it shows variable part. Tell me whether i am right ??
>> > > > >
>> > > > > Size of buf:5757
>> > > > > Size of buf:7134
>> > > > > Size of buf:6927
>> > > > > Size of buf:5670
>> > > > > Size of buf:4989
>> > > > > Size of buf:4004
>> > > > > Size of buf:3615
>> > > > > Size of buf:3188
>> > > > > Size of buf:3022
>> > > > > Size of buf:2703
>> > > > >
>> > > > > Thanks and regards,
>> > > > > Irfan
>> > > > >
>> > > > >
>> > > > >
>> > > > > -----Original Message-----
>> > > > > From: Julien Puydt [mailto:jpuydt at free.fr <jpuydt at free.fr> <
>> > jpuydt at free.fr> <
>> > > jpuydt at free.fr> <
>> > > > jpuydt at free.fr>]
>> > > > > Sent: Mon 10/20/2008 3:29 PM
>> > > > > To: Discussion of the development of GStreamer
>> > > > > Subject: Re: [gst-devel] Size of output buffer
>> > > > >
>> > > > > irfanshaikh a écrit :
>> > > > > > How can i find size of output buffer in "ffmux_asf"
>> which
>> > is
>> > > > > pushed
>> > > > > > to the sink pad of next element ?
>> > > > >
>> > > > > GST_BUFFER_SIZE (buffer) ?
>> > > > >
>> > > > > Snark on #gstreamer
>> > > > >
>> > > > >
>> > >
>> -------------------------------------------------------------------------
>> > > > > This SF.Net email is sponsored by the Moblin Your Move Developer's
>> > > > > challenge
>> > > > > Build the coolest Linux based applications with Moblin SDK & win
>> > great
>> > > > > prizes
>> > > > > Grand prize is a trip for two to an Open Source event anywhere in
>> the
>> > > > world
>> > > > > http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> > > > > _______________________________________________
>> > > > > gstreamer-devel mailing list
>> > > > > gstreamer-devel at lists.sourceforge.net
>> > > > > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>> > > > >
>> > > > > This message (including any attachment) is confidential and may
>> be
>> > > > > legally privileged. Access to this message by anyone other than
>> the
>> > > > intended
>> > > > > recipient(s) listed above is unauthorized. If you are not the
>> > intended
>> > > > > recipient you are hereby notified that any disclosure, copying, or
>> > > > > distribution of the message, or any action taken or omission of
>> > action
>> > > by
>> > > > > you in reliance upon it, is prohibited and may be unlawful. Please
>> > > > > immediately notify the sender by reply e-mail and permanently
>> delete
>> > > all
>> > > > > copies of the message if you have received this message in error.
>> > > > >
>> > > > >
>> > >
>> -------------------------------------------------------------------------
>> > > > > This SF.Net email is sponsored by the Moblin Your Move Developer's
>> > > > > challenge
>> > > > > Build the coolest Linux based applications with Moblin SDK & win
>> > great
>> > > > > prizes
>> > > > > Grand prize is a trip for two to an Open Source event anywhere in
>> the
>> > > > world
>> > > > > http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> > > > > _______________________________________________
>> > > > > gstreamer-devel mailing list
>> > > > > gstreamer-devel at lists.sourceforge.net
>> > > > > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>> > > > >
>> > > > >
>> > > >
>> > > >
>> > > > --
>> > > > Regards,
>> > > >
>> > > > Sudarshan Bisht
>> > > >
>> > > >
>> > > > Hi sudarshan/Ved,
>> > > >
>> > > > In gstffmpegmux.c {gst-ffmpeg-0.10.5/ext/ffmpeg} i do not see
>> any
>> > > > "gst_pad_push" function.
>> > > >
>> > > > I understand we need a function something like "gst_pad_push
>> > > > (asfmux->srcpad, buf)", so as to push the buffer to the sink pad of
>> > next
>> > > > module.
>> > > >
>> > > > But i do not find any such api in gstffmpegmux.c.
>> > > >
>> > > > So i am unable to find the size of output buffer which is send to
>> the
>> > > next
>> > > > module.So i got confused with "gst_pad_push_event"
>> > > >
>> > > > Please can you help me regarding this issue.
>> > > >
>> > > > I need all this information to allocate buffer size for my module
>> "ASF
>> > > > parser" which is built from scratch in C. rite know i am reading
>> from
>> > > file.
>> > > >
>> > > > I need to do same processing in ASF parser when i use ffmux_asf as
>> > input
>> > > > module for ASF parser.
>> > > >
>> > > > Please help me regarding this.
>> > > >
>> > > >
>> > > > Regards,
>> > > > Irfan
>> > > >
>> > > > This message (including any attachment) is confidential and may be
>> > > > legally privileged. Access to this message by anyone other than the
>> > > intended
>> > > > recipient(s) listed above is unauthorized. If you are not the
>> intended
>> > > > recipient you are hereby notified that any disclosure, copying, or
>> > > > distribution of the message, or any action taken or omission of
>> action
>> > by
>> > > > you in reliance upon it, is prohibited and may be unlawful. Please
>> > > > immediately notify the sender by reply e-mail and permanently delete
>> > all
>> > > > copies of the message if you have received this message in error.
>> > > >
>> > > >
>> >
>> -------------------------------------------------------------------------
>> > > > This SF.Net email is sponsored by the Moblin Your Move Developer's
>> > > > challenge
>> > > > Build the coolest Linux based applications with Moblin SDK & win
>> great
>> > > > prizes
>> > > > Grand prize is a trip for two to an Open Source event anywhere in
>> the
>> > > world
>> > > > http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> > > > _______________________________________________
>> > > > gstreamer-devel mailing list
>> > > > gstreamer-devel at lists.sourceforge.net
>> > > > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>> > > >
>> > > >
>> > >
>> > >
>> > > --
>> > > Regards,
>> > >
>> > > Sudarshan Bisht
>> > >
>> > > This message (including any attachment) is confidential and may be
>> > > legally privileged. Access to this message by anyone other than the
>> > intended
>> > > recipient(s) listed above is unauthorized. If you are not the intended
>> > > recipient you are hereby notified that any disclosure, copying, or
>> > > distribution of the message, or any action taken or omission of action
>> by
>> > > you in reliance upon it, is prohibited and may be unlawful. Please
>> > > immediately notify the sender by reply e-mail and permanently delete
>> all
>> > > copies of the message if you have received this message in error.
>> > >
>> > >
>> -------------------------------------------------------------------------
>> > > This SF.Net email is sponsored by the Moblin Your Move Developer's
>> > > challenge
>> > > Build the coolest Linux based applications with Moblin SDK & win great
>> > > prizes
>> > > Grand prize is a trip for two to an Open Source event anywhere in the
>> > world
>> > > http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> > > _______________________________________________
>> > > gstreamer-devel mailing list
>> > > gstreamer-devel at lists.sourceforge.net
>> > > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>> > >
>> > >
>> >
>> >
>> > --
>> > Regards,
>> >
>> > Sudarshan Bisht
>> >
>> > This message (including any attachment) is confidential and may be
>> > legally privileged. Access to this message by anyone other than the
>> intended
>> > recipient(s) listed above is unauthorized. If you are not the intended
>> > recipient you are hereby notified that any disclosure, copying, or
>> > distribution of the message, or any action taken or omission of action
>> by
>> > you in reliance upon it, is prohibited and may be unlawful. Please
>> > immediately notify the sender by reply e-mail and permanently delete all
>> > copies of the message if you have received this message in error.
>> >
>> >
>> -------------------------------------------------------------------------
>> > This SF.Net email is sponsored by the Moblin Your Move Developer's
>> > challenge
>> > Build the coolest Linux based applications with Moblin SDK & win great
>> > prizes
>> > Grand prize is a trip for two to an Open Source event anywhere in the
>> world
>> > http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> > _______________________________________________
>> > gstreamer-devel mailing list
>> > gstreamer-devel at lists.sourceforge.net
>> > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>> >
>> >
>>
>>
>> --
>> Regards,
>>
>> Sudarshan Bisht
>>
>>
>> This message (including any attachment) is confidential and may be legally
>> privileged. Access to this message by anyone other than the intended
>> recipient(s) listed above is unauthorized. If you are not the intended
>> recipient you are hereby notified that any disclosure, copying, or
>> distribution of the message, or any action taken or omission of action by
>> you in reliance upon it, is prohibited and may be unlawful. Please
>> immediately notify the sender by reply e-mail and permanently delete all
>> copies of the message if you have received this message in error.
>>
>> -------------------------------------------------------------------------
>> This SF.Net email is sponsored by the Moblin Your Move Developer's
>> challenge
>> Build the coolest Linux based applications with Moblin SDK & win great
>> prizes
>> Grand prize is a trip for two to an Open Source event anywhere in the
>> world
>> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>
>>
>
>
> --
> Regards,
>
> Sudarshan Bisht
>
> The information contained in this electronic message and any attachments to
> this message are intended for the exclusive use of the addressee(s) and may
> contain proprietary, confidential or privileged information. If you are not
> the intended recipient, you should not disseminate, distribute or copy this
> e-mail. Please notify the sender immediately and destroy all copies of this
> message and any attachments contained in it.
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
>
--
Regards,
Sudarshan Bisht
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20081107/57052f53/attachment.htm>
More information about the gstreamer-devel
mailing list